package com.itheima.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.common.BaseContext;
import com.itheima.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

//检测用户是否已经完成登录


@Slf4j
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")//拦截所有
public class LoginCheckFilter implements Filter {
    //    路径匹配器,支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
//       向下转型
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
//1、获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到的路径是 {}", requestURI);
//        定义不需要处理的路径
        String[] urls = {
                "/employee/login",//后台登录
                "/employee/logout",
                "/static/**",
                "/backend/**",
//                "/common/upload",
//                "/favicon.ico"
                "/user/sendMsg",//移动端登录发验证码
                "/user/login",
//                接口文档放行
                "/doc.html",
                "/web.jars",
                "/swagger-resources",
                "/v2/api-docs"

        };

//2、判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        log.info("不需要处理 {}", check ? "是" : "需要处理");


//3、如果不需要处理，则直接放行
        if (check) {
            log.info("已放行");
            filterChain.doFilter(request, response);
            return;
        }
//4-1、判断登录状态，如果已登录，则直接放行入、如果未登录则返回未登录结果
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录，用户id为{}", request.getSession().getAttribute("employee"));
//            当前用户的id
            Long empId = (Long) request.getSession().getAttribute("employee");
//            把当前用户的id放入线程中
            BaseContext.setCurrentId(empId);


            filterChain.doFilter(request, response);
            return;
        }

        //4-2、判断登录状态，如果已登录，则直接放行入、如果未登录则返回未登录结果(移动端)
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录，用户id为{}", request.getSession().getAttribute("user"));
//            当前用户的id
            Long userId = (Long) request.getSession().getAttribute("user");
//            把当前用户的id放入线程中
            BaseContext.setCurrentId(userId);


            filterChain.doFilter(request, response);
            return;
        }
//5、判断登录状态，如果未登录，通过输出流向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        log.info("未登录跳转到登录页面");
        return;
    }

    /**
     * 定义方法是否需要处理请求
     *
     * @param urls
     * @param requestURI
     * @return
     */


    public boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;

    }

}
